TiF3 catalyzed MgH2 as a Li/Na ion battery anode

• Published in: International journal of hydrogen energy Vol. 43; no. 43; pp. 20033 - 20040
• Main Authors: Xu, Yaolin, Mulder, Fokko M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 25.10.2018
• Subjects: Li ion battery; MgH2; Na ion battery; TiF3; MgH2; Na ion battery; Li ion battery; TiF3
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2018.09.003

MgH2 has been considered as a potential anode material for Li ion batteries due to its low cost and high theoretical capacity. However, it suffers from low electronic conductivity and slow kinetics for hydrogen sorption at room temperature that results in poor reversibility, cycling stability and rate capability for Li ion storage. This work presents a MgH2–TiF3@CNT based Li ion battery anode manufactured via a conventional slurry based method. Working with a liquid electrolyte at room temperature, it achieves a high capacity retention of 543 mAh g−1 in 70 cycles at 0.2 C and an improved rate capability, thanks to the improved hydrogen sorption kinetics with the presence of catalytic TiF3. Meanwhile, the first realization of Na ion uptake in MgH2 has been evidenced in experiments. [Display omitted] •A MgH2–TiF3@CNT electrode is fabricated via a slurry-based method.•It achieves a high cycling stability and rate capability for Li ion storage.•TiF3 enhances the kinetics of hydrogen sorption and Li ion uptake in MgH2.•The dealloying of LixMgy is less reversible than the delithiation of LiH.•The fist realization of Na ion uptake in MgH2 is evidenced in experiments.